# Chem #1

 The flashcards below were created by user dee3215 on FreezingBlue Flashcards. Which of the following cannot be seperated into a simpler substance by chemical means? A. ElementB. EmulsionC. CompoundD. Homogenous mixtureE. Heterogenous mixture If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? A. SoluteB. CompoundC. Homogenous mixtureD. Heterogenous mixtureE. Solvent The SI prefixes milli and mega represent, respectively: A. 10^6 and 10^-6B. 10^-3 and 10^6C. 10^3 and 10^-6D. 10^-3 and 10^9E. 10^-6 and 10^-3 How many milliliters is 0.0055L? A. 0.55mLB. 5.5 mLC. 0.55 mLD. 0.0000055mLE. 182 mL How many inches are in 382.5 cm? (1in=2.54cm) A. 150.6 inB. 6.641x10^-3 inC. 151 inD. 971.6 inE. 972 in 382.5 cm x 1in/2.54 cm=150.6 What is the volume of a container that contains 14.3g of a substance having a density of 0.988 g/cm3? 14.5 cm3 14.3gx 1cm/.988g=14.5g/cm3 if you have a graduated cylinder containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95g is dropped into the graduated cylinder then what is the density of this metal? 9.97x10^-2 g/mL Radio waves travel at the speed of light which is 3.00x10^8 m/s. How many minutes does it take for a radio message to reach earth from saturn if saturn is 7.9x10^8 km from earth? 44 min7.9x10^8 km x 1sec/3x10^8 m3x10^8/1sec x 60sec/min x 1km/1000= 1.8x10^7 km/min 1min/1.8x10^7 km x 7.9 x10^8/1min = 44min If the temperature is 38F then what is the temperature in Kelvin? 276.5 K 38-32/1.8 = 3.34 C3.34C + 273K= 276.5K Select the answer with the correct number of decimal places for the following sum: 13.914 cm+ 243.1 cm + 12.00460 cm= 269.0 cm Express 122F in C 50.0 C 122F-32/1.8=50C Convert 500 milliliters to quarts. (1L=1.06qt) 0.528 qt 500 mlx 1L/1000mlx 1.06 qt/1L = 0.52 qt After carrying out the operations below, how many significant figures are appropriate to show in the result? (13.7 + 0.027) / 8.221 3 significant figures The speed needed to escape the pull of earth's gravity is 11.3 km/s. What is this speed in mi/h? (1mi=1609m) 25,300 mi/h 11.3km/1hr x 1000 m/1km x 1mile/1609m x 60 sec/min x 60 min/1hr-= 25,300mi/h The SI base unit of mass is Kilogram Acetone, which is used as a solvent and as a reactant in the manufacture of plexiglass boils at 56.1C What is the boiling point in degrees Farenheit? 133F 1.8 X 56.1 + 32= 133 Which of the following is a chemical change? Broiling a steak on a grill The number 6.0448, rounded to 3 decimal places, becomes 6.045 TRUE Matter is anything that has mass and occupies space TRUE When applying the scientific method, a model or theory should be based on experimental data. True The scientist who determined the magnitude of the electric charge of the electron was Robert Millkan Which of the following is a type of radioactive radiation which has no charge and are unaffected by external electric or magnetic fields? Y Rays Which of these scientists developed the nuclear model of the atom? Ernest Rutherford Which one of the following statements about atoms and subatomic particles is correct? A neutral atom contains equal numbers of protons and electrons Atoms of the same element with different mass numbers are called Isotopes How many neutrons are there in an atom of lead whose mass number is 208? 126 208-82=126 Give the number of protons (p), electrons (e), and neutrons (n) in one atom of Chlorine-37 17p, 17e, 20n A magnesium ion, Mg2+, has 12 protons and 10 electrons An oxide ion, O^2-, has 10 protons and 8 electrons The elements in a column of the periodic table are known as a group Which of the following is a non-metal? bromine, Br, Z=35 Which of these elements is chemically similar to magnesium? Calcium Which of the following is the empirical formula for hexane, C6H14? C3H7 The compound, P4S10, is used in the manufacture of safety matches. What is its name? Tetraphosphorus Decasulfide Tetrasulfur dinitride decomposes explosively when heated. What is it's formula? S4N2 An anion is defined as A charged atom or group of atoms with a net negative charge. Which pair of elements would be most likely to form an ionic compound? F and Al What is the formula for the ionic compound formed by calcium ions and nitrate ions? Ca (NO3)2 What is the formula for the ionic compound formed by calcium and selenium? CaSe The formula for magnesium sulfate is MgSO4 Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials. What is it's formula? KMnO4 What is the name of Mn(CO3)2? Maganese (IV) carbonate Iron (III) Chloride hexahydrate is used as a coagulant for sewage and industrial wastes. What is it's formula? FeCl3 6H2O Which of the follwoing are allotropes? diamond and graphite Which of these elements is chemically similar to potassium? Cesium What is the correct name for ClO3- Chlorate Ion A compound with an -OH functional group is called Alcohol An alkane with eight carbons would be called Octane How many hydrogen atoms are in the propane compound? 8 C3H8 What is the formula for Aluminum Oxide? Al2 O3 Authordee3215 ID16857 Card SetChem #1 DescriptionConversions, Si prefixes Updated2010-04-30T01:09:17Z Show Answers